Automatic lock for elevator-hatchway doors.



No. 740,154. A PATENTBD SEPT. 29-, 1903. A. MAGNUSON & T. ESKILSSON. AUTOMATIC LOCK FOE ELEVATOR HAT-GHWAY nooas.

APPLICATION FILED JULY 22, 1903 H0 MODEL.

.lm/ M/ i NVENTORS Z/ii;

ATTORNEY To all whom it may concern:

citizen of the United States, and a resident of locked and are automatically released or un- :30. *r'aonsa.

UNITED ST TES AXEL tine'no'soiv, or ISLAND CITY, or EAST ORANGE, NEW JERSEY,

- v Patented September 29, 1903.

PATENT OFFICE,

new YORK,'AND THEODOR ESKILSSON, or none ew YORK, ASSIGNOBS TO OTIS ELEVATOR COMPANY,

A CORPORATION OF NE /V JERSEY;

SPECIFICATION forming part of Letters Patent-No.

740,154, died September 29, 1902 Application filed July 22 1903. Serial No. 166.608. (No model.)

Be it known that we, AXEL MAGNUsON, a

the borough of Manhattan, in the city and county of New York, and THEODOR EsKILssoN, a subject of the King of Sweden and Norway, and a resident of Long Island City, in the county of Queens, State of New York, have invented certain new and useful Improvements in Automatic Looks for Elevator- I-Iatchway Doors, of which the following is a specification.

Our invention relates to looks for doors in elevator-hatchways, and more particularly to those by which the doors are normally locked one at a time when the elevator-car stops at the different landings. Various locks for this purpose have been in use. One of the difficulties experienced has been that the doors leading into the hatchway become unlocked or can be unlocked as the car passes them. Another objectionable feature of those in use is that the car as it passes the landings strikes a tripping device and makes a noise and in some cases enables a person standing at one of the doors to open it as the car passes and strikes the tripping device.

The object of our invention is to overcome these and other objectionable features of the devices now in use and to provide a simple and eltective device whereby a door will be unlocked only when the elevator-car stops or is about to stop at a landing.

As will appear hereinafter, our invention may be applied to many of the automatic door-locks now in use to great advantage.

The accompanying drawing represents an elevator-car and one of the hatchway-doors embodying our invention.

represents an elevator-car.

represents a hatchway-door supported on a fixed rail 22 by the rollers 21 21. A depression or notch 23 is shown in thetop of the door.

is a bell-crank device pivoted at a fixed point 31 on the hatchway-wall, having at one end a hook 33, adapted to engage the'notch 23, and at the other end a roller 32.

40 is the fiat surface of a movable cam, having inclined surfaces 41 41. This cam is supported by links 42 4'2, pivoted at fixed points 43 43on the car and to the cam at 44 44:. I

4:5 is a solenoid, 46 its core, and 47 a rod connecting the core i6 to the pivot 44. 7 50 represents the elevator-operating device in the car. In this case an electric switch 53 is the operating-lever, and 51 52 electric contacts.

6O,v 61, 62, and (i3 represent electric wires connecting the various parts, as will be explained later.

40" 42 42 show in dotted lines another po* sition of the cam and its supporting-links.

32 33 show the bell-crank lever in locking position.

The wire is connected to a suitable source of electrical supply and to the solenoid 45. The electrical circuit then goes by the wire 61 to the oar-switch, and if the lever 53 is moved to one side or the otherto cause the car to travel up or down the circuit is completed through the lever, the contacts 51 or 52, and the wires 62 or 63. Thus it will appear that when the car-switch is in running position and the car is running an electrical current will run through the solenoid 45, and it will be excited and draw in its core 46. This will move the earn up into the position indicated by the dotted line 40. is centered to stop the car, the circuit through the solenoid will be broken at 51 or 52 and the cam will drop back into the position shown by the full lines.

Every doorin the hatchway may be'provided with a lock like that represented by the notch 23 and the latch 33. The latter are normally in the position indicated by the dotted lines 33 and the rollers on the other endv of the belLcrank are in the position indicated at 32. \Vhen the elevator-car is runnin g and the cam is in the position 40, as before described, the car will pass up and down the hatchway without any effect whatever, asthe cam is then pulled back out of contact with the rollers 32.

The operation is as follows: lVhen the oplVhen the car-switch erator in the car desires to stop the car at a given landing, he brings the operating-lever 53 to the central or stop position. This will break the circuit through the solenoid and the cam will drop into the position shown by the full lines 40, as already explained. WVhen in this position, the cam is adapted to engage the roller 32 on the bell-crank, and as the car advances the latter willrun up on the inclined surfaces 41 41 onto the surface 40, and thus be pushed into the position shown by the full lines at 32 This will cause the latch 33 to be raised out of the notch 23 and the door will be unlocked. One may then slide the door open at will. hen the cam 40 is in this stop position, the links 42 42 will be in a horizontal position or else slightly lower at the end 4A 44, so that the cam will not be pushed back by the pressure of the roller 32.

It may also be arranged so that if the surface- 40 of the cam is opposite the roller 32 when the current is cut ofl from the solenoid the weight of the core 40 and the cam will push the roller back and unlock the door.

\Vhile we have shown our device in conjunction with the car-switch of an electricallyoperated elevator, this is not necessary, as it may be used with any type of elevator if the solenoid 45 is arranged to be excited when the elevator-operating mechanism is put in use and denergized when the operating mechanism is brought to its stop position.

Many of the devices in use for unlocking a hatchway-door when the car is at the floor are operated by a fixed cam or projection on the car engaging with some part of the doorlocking mechanism. It is evident that our movable cam may be substituted for such fixed cam, thus greatly improving the devices 1. In combination with an elevator car, a

accidents due 40 hatchway-door, a lock for said door, means 45 carried by the car for releasing the lock and electromagnetic means for moving said releasing device out ofoperative position.

2. In combination with an elevator-car, a hatchway-door at each landing, a lock for each door, means carried by the car for releasing the locks and electromagnetic means for moving said releasing device out of operative position'while the car is passing a floor.

3. In an elevator the combination of a car, an operating mechanism in the car, a hatch way-door, a lock for said door, a device for releasing the look when the car is opposite the door, and electrical means for moving such releasing device out of the operative position when the operating mechanism is in operating position.

4. In an elevator the combination of a car, an operating mechanism in the car, a hatchway-door, a lock for said door, a device carried by the car for releasing the lock, and electrical means for moving such releasing device out of operative position when the operating mechanism is in operative position.

In testimony whereof we have set our names to this specification in the presence of two witnesses.

E. W. MARsHALL, HENRY E. KIRBY. 

